First release, might be buggy!

Signed-off-by: Danct12 <danct12@disroot.org>

.gitmodules

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+[submodule "src/busybox"]
+	path = src/busybox
+	url = git://git.busybox.net/busybox
+[submodule "src/linux"]
+	path = src/linux
+	url = https://gitlab.com/pine64-org/linux.git
+	branch = pine64-kernel-5.5.y
+[submodule "src/u-boot"]
+	path = src/u-boot
+	url = https://github.com/u-boot/u-boot
+[submodule "src/arm-trusted-firmware"]
+	path = src/arm-trusted-firmware
+	url = https://github.com/ARM-software/arm-trusted-firmware.git

README.md

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+# Rescue SD for PinePhone
+
+This image is a swiss army knife solution for **PinePhone eMMC**.
+
+You can use this to flash a image **directly to eMMC**, troubleshooting a broken system, and a lot more.
+
+## This project is built on:
+- [Busybox](https://busybox.net) - which is [GPLv2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).
+- [Pine64's kernel fork](https://gitlab.com/pine64-org/linux) - which is [GPLv2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).
+- [U-Boot](https://github.com/u-boot/u-boot) - which has [multiple licenses](https://github.com/u-boot/u-boot/tree/master/Licenses)
+
+## Support
+- Discord: https://discord.gg/AvtdRJ3
+- Matrix: #danctnix-portingv2:matrix.org

build.sh

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+#!/bin/sh
+
+# EDIT THIS:
+export ARCH=arm64
+export CROSS_COMPILE=aarch64-linux-gnu-
+IMAGE_NAME="pinephone-sdrescue.img"
+
+# Cleanup first
+rm -rf src/busybox/out
+rm -rf src/linux/out
+rm -rf usr
+
+# Build Busybox
+cd src/busybox
+mkdir out
+cp ../busybox_config out/.config
+make O=out -j$(nproc --all)
+cd ../..
+
+# Build Linux Kernel
+cd src/linux
+mkdir out
+patch -p1 -N < ../linux-disable_sysrq-msgs.diff || true
+cp ../linux_config out/.config
+make O=out -j$(nproc --all)
+cd ../..
+
+# Make initramfs
+sudo cp -v src/busybox/out/busybox initramfs/bin/
+cd initramfs
+find . | cpio -H newc -o > ../initramfs.cpio
+cd ..
+cat initramfs.cpio | gzip > recovery.gz
+
+# Create image
+truncate --size 50M $IMAGE_NAME
+
+cat << EOF | fdisk pinephone-sdrescue.img 
+o
+n
+p
+1
+2048
+102399
+w
+EOF
+
+LOOP_DEVICE=$(losetup -f)
+sudo losetup -P $LOOP_DEVICE $IMAGE_NAME
+sudo mkfs.fat -F32 ${LOOP_DEVICE}p1
+mkdir mount
+sudo mount ${LOOP_DEVICE}p1 mount
+sudo cp -v src/linux/out/arch/arm64/boot/Image.gz mount
+sudo cp -v src/linux/out/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtb mount
+sudo cp -v recovery.gz mount
+sudo mkimage -A arm -O linux -T script -C none -n "U-Boot boot script" -d src/boot.txt mount/boot.scr
+sudo umount mount
+rm -rf mount
+
+wget http://dl-cdn.alpinelinux.org/alpine/edge/main/aarch64/u-boot-pine64-2020.01-r0.apk
+tar xvf u-boot-pine64-2020.01-r0.apk
+sudo dd if=usr/share/u-boot/pine64-lts/u-boot-sunxi-with-spl.bin of=${LOOP_DEVICE} bs=8k seek=1
+
+sudo losetup -d $LOOP_DEVICE

initramfs/bin/clear

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+busybox

initramfs/bin/mkdir

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+busybox

initramfs/bin/mount

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+busybox

initramfs/bin/sh

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+busybox

initramfs/init

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+#!/bin/sh
+
+################################################
+# Copyright (c) 2020 - Dreemurrs Embedded Labs #
+################################################
+
+. /init_functions.sh
+
+# Environment variables that we want:
+IP=172.16.42.1
+
+# Mount things needed by this script
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+mkdir /config
+mount -t configfs -o nodev,noexec,nosuid configfs /config
+
+# /dev/pts (needed for telnet)
+mkdir -p /dev/pts
+mount -t devpts devpts /dev/pts
+
+# LED indicator for MMC r/w access
+echo mmc2 > /sys/class/leds/pinephone\:green\:user/trigger
+
+# Create all the symlinks to /bin/busybox
+echo "Installing Busybox..." && /bin/busybox --install -s
+
+# Create device nodes
+echo "Creating device nodes..."
+mknod /dev/null c 1 3
+mknod /dev/tty c 5 0
+mdev -s
+
+# Finishing rescue setup
+setup_usb_configfs
+start_udhcpd
+setup_telnetd
+
+# We'll just give some new lines cuz why not.
+printf "\n\n"
+
+echo "Rescue SD has initialized!"
+echo "Please connect the device to your computer."
+echo
+echo "* Telnet: $IP (port 23)"
+
+loop_forever

initramfs/init_functions.sh

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+setup_usb_configfs() {
+	# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
+	CONFIGFS=/config/usb_gadget
+
+	if ! [ -e "$CONFIGFS" ]; then
+		echo "$CONFIGFS does not exist, this is not good."
+		crash_kernel
+	fi
+
+	# Default values for USB-related deviceinfo variables
+	usb_idVendor="0x1F3A"
+	usb_idProduct="0xEFE8"
+	usb_serialnumber="Rescue SD Boot"
+	usb_rndis_function="rndis.usb0"
+	usb_mass_storage_function="mass_storage.0"
+
+	echo "Setting up an USB gadget through configfs..."
+	# Create an usb gadet configuration
+	mkdir $CONFIGFS/g1 || ( echo "Couldn't create $CONFIGFS/g1" ; crash_kernel )
+	echo "$usb_idVendor"  > "$CONFIGFS/g1/idVendor"
+	echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
+
+	# Create english (0x409) strings
+	mkdir $CONFIGFS/g1/strings/0x409 || echo "  Couldn't create $CONFIGFS/g1/strings/0x409"
+
+	# shellcheck disable=SC2154
+	echo "Pine64" > "$CONFIGFS/g1/strings/0x409/manufacturer"
+	echo "$usb_serialnumber"        > "$CONFIGFS/g1/strings/0x409/serialnumber"
+	# shellcheck disable=SC2154
+	echo "PinePhone"         > "$CONFIGFS/g1/strings/0x409/product"
+
+	# Create rndis/mass_storage function
+	mkdir $CONFIGFS/g1/functions/"$usb_rndis_function" \
+		|| echo "  Couldn't create $CONFIGFS/g1/functions/$usb_rndis_function"
+	mkdir $CONFIGFS/g1/functions/"$usb_mass_storage_function" \
+		|| echo "  Couldn't create $CONFIGFS/g1/functions/$usb_mass_storage_function"
+
+	# Create configuration instance for the gadget
+	mkdir $CONFIGFS/g1/configs/c.1 \
+		|| echo "  Couldn't create $CONFIGFS/g1/configs/c.1"
+	mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 \
+		|| echo "  Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
+	echo "rndis" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration \
+		|| echo "  Couldn't write configration name"
+
+	# Make sure there is a mmcblk2 (eMMC)...
+	if [ -z "$(ls /dev/mmcblk2)" ]; then
+		echo "eMMC is not found, something is horribly wrong!!"
+		echo "It's probably better to make Huong Tram release a new music video."
+		crash_kernel
+	fi
+
+	# Set up mass storage to internal EMMC
+	echo /dev/mmcblk2 > $CONFIGFS/g1/functions/"$usb_mass_storage_function"/lun.0/file
+
+	# Link the rndis/mass_storage instance to the configuration
+	ln -s $CONFIGFS/g1/functions/"$usb_rndis_function" $CONFIGFS/g1/configs/c.1 \
+		|| echo "  Couldn't symlink $usb_rndis_function"
+	ln -s $CONFIGFS/g1/functions/"$usb_mass_storage_function" $CONFIGFS/g1/configs/c.1 \
+		|| echo "  Couldn't symlink $usb_mass_storage_function"
+
+	# Check if there's an USB Device Controller
+	if [ -z "$(ls /sys/class/udc)" ]; then
+		echo "No USB Device Controller available, something is horribly wrong!!"
+		echo "Please let Danct12 know this."
+		crash_kernel
+	fi
+
+	# shellcheck disable=SC2005
+	echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC || ( echo "Couldn't write UDC." ; crash_kernel )
+}
+
+setup_telnetd() {
+	echo "Starting telnet daemon..."
+	{
+		echo "#!/bin/sh"
+		echo "echo \"Welcome to Rescue SD Shell!\""
+		echo "sh"
+	} >/telnet_connect.sh
+	chmod +x /telnet_connect.sh
+	telnetd -b "${IP}:23" -l /telnet_connect.sh
+
+}
+
+start_udhcpd() {
+	# Only run once
+	[ -e /etc/udhcpd.conf ] && return
+
+	# Get usb interface
+	INTERFACE=""
+	ifconfig rndis0 "$IP" 2>/dev/null && INTERFACE=rndis0
+	if [ -z $INTERFACE ]; then
+		ifconfig usb0 "$IP" 2>/dev/null && INTERFACE=usb0
+	fi
+	if [ -z $INTERFACE ]; then
+		ifconfig eth0 "$IP" 2>/dev/null && INTERFACE=eth0
+	fi
+
+	if [ -z $INTERFACE ]; then
+		echo "Could not find an interface to run a DHCP server on, this is not good."
+		echo "Interfaces:"
+		ip link
+		return
+	fi
+
+	echo "Network interface $INTERFACE is used"
+
+	# Create /etc/udhcpd.conf
+	{
+		echo "start 172.16.42.2"
+		echo "end 172.16.42.2"
+		echo "auto_time 0"
+		echo "decline_time 0"
+		echo "conflict_time 0"
+		echo "lease_file /var/udhcpd.leases"
+		echo "interface $INTERFACE"
+		echo "option subnet 255.255.255.0"
+	} >/etc/udhcpd.conf
+
+	echo "Started udhcpd daemon for rescue purposes"
+	udhcpd
+}
+
+crash_kernel() {
+	echo "panic: We're hanging here..."
+	# shellcheck disable=SC1001
+	echo panic > /sys/class/leds/pinephone\:red\:user/trigger
+	echo c > /proc/sysrq-trigger
+}
+
+loop_forever() {
+	while true; do
+		sleep 1
+	done
+}

src/arm-trusted-firmware

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+Subproject commit f9ea3a6291b45bddda0564e8ff654a615933b173

src/boot.txt

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+setenv kernel_addr_z 0x44080000
+
+setenv bootargs loglevel=0 silent console=tty0
+
+if load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_z} /Image.gz; then
+  unzip ${kernel_addr_z} ${kernel_addr_r}
+  if load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} /sun50i-a64-pinephone.dtb; then
+    if load ${devtype} ${devnum}:${distro_bootpart} ${ramdisk_addr_r} /recovery.gz; then
+      booti ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r};
+    else
+      booti ${kernel_addr_r} - ${fdt_addr_r};
+    fi;
+  fi;
+fi

src/busybox

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+Subproject commit 9aa751b08ab03d6396f86c3df77937a19687981b

src/linux

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+Subproject commit 51b5d93fce96448c0f93b98c1e28c85d6df3da78

src/linux-disable_sysrq-msgs.diff

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+diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
+index 573b20551..42b040d16 100644
+--- a/drivers/tty/sysrq.c
++++ b/drivers/tty/sysrq.c
+@@ -551,7 +551,6 @@ void __handle_sysrq(int key, bool check_mask)
+ 		 * should not) and is the invoked operation enabled?
+ 		 */
+ 		if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
+-			pr_info("%s\n", op_p->action_msg);
+ 			console_loglevel = orig_log_level;
+ 			op_p->handler(key);
+ 		} else {

src/u-boot

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+Subproject commit c00bd81ae0d6eb1f94e26b31be3a64cadaa05bcb